In the actual operation of the photovoltaic power generation system, the components are exposed to the environment. Over time, the surface of the component will accumulate a lot of dust, and even the bird's excrement, leaves, snow and other partial occlusion, which affects the efficiency of the system. One of the biggest factors in the factor. The results of a research group in Greece show that the effects of soil, lime and dust deposition on the efficiency of the power station system under the same coverage conditions, the impact of dust (the main product of air pollution) is the greatest, when the ash density reaches At 3 grams per square meter, the amount of electricity generated can be reduced by more than 15%.
Photovoltaic modules are very sensitive to temperature, and with the accumulation of dust on the surface of the components, the heat transfer resistance of the photovoltaic modules is increased, and the thermal insulation layer on the photovoltaic modules affects the heat dissipation. Studies have shown that the temperature of the solar cell rises by 1 ° C and the output power drops by about 0.5%. Moreover, under the long-term sunlight, the temperature of the part covered by the dust is much higher than that of the uncovered part, and the partially-covered panel will be changed from the power generating unit to the power-consuming unit, and the shielded photovoltaic cell will become a load that does not generate electricity. The resistor consumes the power generated by the connected battery, causing the dark spot to burn out if the temperature is too high. This process can exacerbate the aging of the panel and reduce the output. In severe cases, the component will burn out. In addition, dust adheres to the surface of the panel, which blocks the light, absorbs and reflects, and the most important is the blocking effect of light. The color of the dust is deep, the particles are small, and the light transmittance is poor. The thin layer can not penetrate much light, which affects the absorption of light by the photovoltaic panel, thereby affecting the photovoltaic power generation efficiency.
According to the data survey, the storage and transportation costs and construction fees of household photovoltaic power stations are significantly higher than those of conventional power plants, accounting for more than 19% of the total, and the power station is scattered and the capacity is small. The operation and maintenance costs of 20 to 25 years are very high. In the post-subsidy era, in order to bear the interest gap of subsidies, we must consider how to optimize the power station, reduce the cost of operation and maintenance, and increase the amount of power generation.
The revenue of photovoltaic power plants is a process of accumulating and accumulating a large amount of electricity, while the number of panels used by households is relatively small, the cleaning and maintenance costs are relatively low, and the components that are often cleaned and maintained are improved in power generation over time. It must be significant.
Efficient cleaning to increase power plant revenue
Due to the small scale of the household power station, the cleaning work of the power station is basically based on labor. Then the choice of cleaning tools is very important, to improve the cleaning efficiency while reducing costs.
In the case of a small amount of dust and sand, it is only necessary to carry out simple cleaning or rinsing; in the case of mud, bird droppings and other attachments, it is necessary to first rinse, remove the particles, and then clean to avoid particulate matter. Stick to the electric board; for the leaves and floating ash on the electric board, use a soft brush to sweep. The use of hard and sharp tools or corrosive solvents and alkaline organic solvents should be avoided to wipe the PV modules. The impact pressure of the cleaning equipment on the components must be controlled within a certain range to avoid cracking due to improper force.